This name is a synonym of Euphorbia anthonyi Brandegee.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 37851) with original publication details: Mem. San Diego Soc. Nat. Hist. 16: 34 1989.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:947311-1.
This name was in version 1 of The Plant List, record kew-37851, and has not been changed.